REVIEW OF GENUS ARGULUS — MEEHEAN 



493 



taining the socket (fig. 31, c). The fourth appendages have a pos- 

 terior flap, which is squarely truncate. There is the usual chitinous 

 ridge surrounding the base of the peg. The peg is a rounded ball on 

 a narrower neck at the distal anterior edge of the basis. Mesial to 

 this is a triangular flap projecting anteriorly and turned ventrally 

 at the tip. The top of the peg seems to be faceted. There is a broad 

 papilla at the male opening between the bases of the fourth 

 appendages. 



FiGDKB 31. — Argulus megalops: a. Ribs of suction cups ; h, respiratory areas ; c, male 

 accessory organs of third and fourth legs. 



The host and localities have been reported as follows : Myoxoceph- 

 alus octodecimspinosus, Salt Harbor, New Brunswick; Pseudo- 

 pleuTonectes americanus^ Pardlichthys dentatus^ Hippoglossoides 

 plate8Soides^ Lophoj^setta macidata^ Pt^onotus carolinus^ Myoxoceph- 

 dlus octodeciTrispinosus^ Lophius piscatorius^ Microgadus tomcod^ 

 and from tows in the Woods Hole region; and finally from the bat- 

 fish {Ogcocephalus sp.), the pinfish {Lagodon rhomhoides) ^ the 

 suckingfish {Echeneis naucrates), and the spiny toadfish {Chilo- 

 mycterus spinosus), on the Gulf coast of Florida. 



